Problem Statement
Count occurrences of element in sorted array.
Approach
Find first and last occurrence. Count = last - first + 1.
Time & Space Complexity
Time O(log n), Space O(1).

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Count using first and last occurrence.
Count occurrences of element in sorted array.
Find first and last occurrence. Count = last - first + 1.
Time O(log n), Space O(1).
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